Can the 0x800a03ec error be caused by missing Excel interop assemblies, and how do I fix this?

By: USER9129
28 Agustus 2025 Support 5 minutes
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Grade: Education Subject: Support
Can the 0x800a03ec error be caused by missing Excel interop assemblies, and how do I fix this?
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Yes, the absence of the correct Excel Interop assemblies is a common culprit. To fix this, ensure that the 'Microsoft.Office.Interop.Excel' assembly is referenced in your C# project. You can add the reference through the 'Add Reference' dialog in Visual Studio. Make sure that the correct version of the assembly is selected, matching the installed version of Excel on the target machine. Also, check the 'Embed Interop Types' property and ensure it's set properly, especially when distributing your application.
Answered on 28 Agustus 2025

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